1. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125
2. Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
3. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
4. Department of Earth System Science, Stanford University, Stanford, CA 94305
5. National Center for Microscopy and Imaging Research, Center for Research in Biological Systems, University of California, San Diego, School of Medicine, La Jolla, CA 92093
6. Department of Civil and Environmental Engineering, McCormick School of Engineering and Applied Science, Northwestern University, Evanston, IL 60208